The last two LB designations covered seven LB-13s with 525-hp Hornets (redesignated in 1930 as five Y1B-4s and two Y1B-6s) and three LB-14s with 575-hp Hornets (redesignated as Y1B-5s). |
The last two LB designations covered seven LB-13s with 525-hp Hornets (redesignated in 1930 as five Y1B-4s and two Y1B-6s) and three LB-14s with 575-hp Hornets (redesignated as Y1B-5s). |